Papers by Alberto Zaffaroni
We consider three dimensional conformal field theories living on a stack of N anti-M2 branes at t... more We consider three dimensional conformal field theories living on a stack of N anti-M2 branes at the tip of eight-dimensional supersymmetric cones. The corresponding supergravity solution is obtained by changing sign to the four-form in the Freund-Rubin solution representing M2 branes ("skew-whiffing" transformation) and it is known to be stable. The existence of these non supersymmetric, stable field theories, at
We analyze the action of Toric (Seiberg) duality on the combined mesonic and baryonic moduli spac... more We analyze the action of Toric (Seiberg) duality on the combined mesonic and baryonic moduli space of quiver gauge theories obtained from D3 branes at Calabi-Yau singularities. We analyze in particular the structure of the master space, the complete moduli space for one brane, for different toric phases of a given singularity. We show that the Hilbert Series for the
In this paper we discuss candidate superconformal N = 2 gauge theories that realize the AdS/CFT c... more In this paper we discuss candidate superconformal N = 2 gauge theories that realize the AdS/CFT correspondence with M-theory compactified on the homoge- neous Sasakian 7-manifolds M7 that were classified long ago. In particular we focus on the two cases M7 = Q1,1,1 and M7 = M1,1,1, for the latter the Kaluza Klein spectrum being completely known. We show how the toric description of M7 sug- gests the gauge group and the supersingleton fields. The conformal dimensions of the latter can be independently calculated by comparison with the mass of baryonic operators that correspond to 5-branes wrapped on supersymmetric 5-cycles and are charged with respect to the Betti multiplets. The entire Kaluza Klein spectrum of short multiplets agrees with these dimensions. Furthermore, the metric cone over the Sasakian manifold is a conifold algebraically embedded in some Cp. The ring of chiral primary fields is defined as the coordinate ring of Cp modded by the ideal generated by the embedding equa...
Physics Letters B, 1994
We study strong-weak coupling duality (S-duality) in N=4 supersymmetric non-Abelian Yang-Mills th... more We study strong-weak coupling duality (S-duality) in N=4 supersymmetric non-Abelian Yang-Mills theories. These theories arise naturally as the low-energy limit of four-dimensional toroidal compactifications of the heterotic string.
Journal of High Energy Physics, 2002
Starting from the Maldacena-Nunez supergravity dual of N = 1 super Yang-Mills theory we study the... more Starting from the Maldacena-Nunez supergravity dual of N = 1 super Yang-Mills theory we study the inclusion of a supersymmetry breaking gaugino mass term. We consider a class of non supersymmetric deformations of the MN solutions which have been recently proposed in the literature. We show that they can be interpreted as corresponding to the inclusion of both a mass and a condensate. We calculate the vacuum energy of the supergravity solutions showing that the N c -fold vacuum degeneracy of the N = 1 theory is lifted by the inclusion of a mass term. * See for the study of a metastable N = 0 solution.
Journal of High Energy Physics, 1999
We discuss issues related to orientifolds and the brane realization for gauge theories with ortho... more We discuss issues related to orientifolds and the brane realization for gauge theories with orthogonal and symplectic groups. We specifically discuss the case of theories with (hidden) global SO(2n) symmetry, from three to six dimensions. We analyze mirror symmetry for three dimensional N=4 gauge theories, Brane Box Models and six-dimensional gauge theories. We also discuss the issue of T-duality for D n space-time singularities. Stuck D branes on ON 0 planes play an interesting role.
Journal of High Energy Physics, 2008
A new infinite class of Chern-Simons theories in 2+1 dimensions is presented using brane tilings.... more A new infinite class of Chern-Simons theories in 2+1 dimensions is presented using brane tilings. The new class reproduces all known cases so far and introduces many new models that are dual to M2 brane theories which probe a toric non-compact singular CY 4-fold. The master space of the quiver theory is used as a tool to construct the moduli space for this class and the Hilbert Series is computed for a selected set of examples. * [email protected]
Journal of High Energy Physics, 2009
Brane tilings are efficient mnemonics for Lagrangians of N = 2 Chern-Simons-matter theories. Such... more Brane tilings are efficient mnemonics for Lagrangians of N = 2 Chern-Simons-matter theories. Such theories are conjectured to arise on M2-branes probing singular toric Calabi-Yau fourfolds. In this paper, a simple modification of the Kasteleyn technique is described which is conjectured to compute the three dimensional toric diagram of the non-compact moduli space of a single probe. The Hilbert Series is used to compute the spectrum of non-trivial scaling dimensions for a selected set of examples.
Journal of High Energy Physics, 1999
A realization of E n+1 monopoles in string theory is given. The NS five brane stuck to an Orienti... more A realization of E n+1 monopoles in string theory is given. The NS five brane stuck to an Orientifold eight plane is identified as the 't Hooft Polyakov monopole. Correspondingly, the moduli space of many such NS branes is identified with the moduli space of SU(2) monopoles. These monopoles transform in the spinor representation of an SO(2n) gauge group when n D8 branes are stacked upon the orientifold plane. This leads to a realization of E n+1 monopole moduli spaces. Charge conservation leads to a dynamical effect which does not allow the NS branes to leave the orientifold plane. This suggests that the monopole moduli space is smooth for n < 8. Odd n > 8 obeys a similar condition. Using a chain of dualities, we also connect our system to an Heterotic background with Kaluza-Klein monopoles.
Nuclear Physics B, 1998
We discuss the spectrum of states of IIB supergravity on AdS 5 × S 5 in a manifest SU (2, 2/4) in... more We discuss the spectrum of states of IIB supergravity on AdS 5 × S 5 in a manifest SU (2, 2/4) invariant setting. The boundary fields are described in terms of N = 4 superconformal Yang-Mills theory and the proposed correspondence between supergravity in AdS 5 and superconformal invariant singleton theory at the boundary is formulated in an N = 4 superfield covariant language.
Journal of High Energy Physics, 2006
We analyze the supersymmetry conditions for a class of SU(2) structure backgrounds of Type IIB su... more We analyze the supersymmetry conditions for a class of SU(2) structure backgrounds of Type IIB supergravity, corresponding to a specific ansatz for the supersymmetry parameters. These backgrounds are relevant for the AdS/CFT correspondence since they are suitable to describe mass deformations or beta-deformations of four-dimensional superconformal gauge theories. Using Generalized Complex Geometry we show that these geometries are characterized by a closed nowhere-vanishing vector field and a modified fundamental form which is also closed. The vector field encodes the information about the superpotential and the type of deformation -mass or beta respectively. We also show that the Pilch-Warner solution dual to a massdeformation of N = 4 Super Yang-Mills and the Lunin-Maldacena beta-deformation of the same background fall in our class of solutions.
Nuclear Physics B, 2001
We analyse the Seiberg Witten curve describing the N = 2 gauge theory dual to the supergravity so... more We analyse the Seiberg Witten curve describing the N = 2 gauge theory dual to the supergravity solution with fractional branes. Emphasis is given to those aspects that are related to stringy mechanism known as the enhançon. We also compare our results with the features of the supergravity duals, which have been variously interpreted in the literature. Known aspects of the N = 2 gauge theories seem to agree with the supergravity solution, whenever the two theories can be faithfully compared.
Journal of High Energy Physics, 2001
We discuss some issues about the holographic interpretation of the compact Randall-Sundrum model,... more We discuss some issues about the holographic interpretation of the compact Randall-Sundrum model, which is conjectured to be dual to a 4d field theory with non-linearly realized conformal symmetry. We make several checks of this conjecture. In particular, we show that the radion couples conformally to a background 4d metric. We also discuss the interpretation of the Goldberger-Wise mechanism for stabilizing the radion. We consider situations where the electroweak breaking stabilizes the radion and we discuss the issue of natural conservation of flavor quantum numbers. * Basically this can also be seen as flatness of the two moduli corresponding to the brane positions z 0 and z 1 . Notice however that only one combination, say z 0 /z 1 corresponds to a 4d scalar. The other, say z 0 , represents the conformal factor of the 4d metric.
Page 1. Superconformal field theories, multiplet shortening, and the AdS 5 /SCFT 4 correspondence... more Page 1. Superconformal field theories, multiplet shortening, and the AdS 5 /SCFT 4 correspondence Sergio Ferrara CERN Geneva, Switzerland e-mail: [email protected] Alberto Zaffaroni CERN Geneva, Switzerland e-mail: [email protected] Abstract. ...
arXiv:hep-th/9508056v1 13 Aug 1995 hep-th/9508056 CERN-TH/95-217 NYU-TH-95/07/02 IFUM/515/FT
We describe a simple and efficient mechanism by which very heavy particles are copiously created ... more We describe a simple and efficient mechanism by which very heavy particles are copiously created from a primordial inflationary epoch. It works for scalar fields which are massless or very light during inflation and acquire a large mass right after the end of inflation.
It is argued that N=6 supergravity on AdS 5 , with gauge group SU(3) × U(1) corresponds, at the c... more It is argued that N=6 supergravity on AdS 5 , with gauge group SU(3) × U(1) corresponds, at the classical level, to a subsector of the "chiral" primary operators of N=4 Yang-Mills theories. This projection involves a "duality transformation" of N=4 Yang-Mills theory and therefore can be valid if the coupling is at a self-dual point, or for those amplitudes that do not depend on the coupling constant.
Starting from the Maldacena-Nunez supergravity dual of N = 1 super Yang-Mills theory we study the... more Starting from the Maldacena-Nunez supergravity dual of N = 1 super Yang-Mills theory we study the inclusion of a supersymmetry breaking gaugino mass term. We consider a class of non supersymmetric deformations of the MN solutions which have been recently proposed in the literature. We show that they can be interpreted as corresponding to the inclusion of both a mass and a condensate. We calculate the vacuum energy of the supergravity solutions showing that the N c -fold vacuum degeneracy of the N = 1 theory is lifted by the inclusion of a mass term. * See for the study of a metastable N = 0 solution.
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Papers by Alberto Zaffaroni